1925-P Peace Dollar With Dots. How Are Dots Formed? VAM?

A friend's inherited Peace dollar collection has an interesting 1925-P with multiple dots on the reverse with greenish hues. One dot seems to have some metal debris or a die break next to it.

It appears unattributed on VAMworld. There are no VAMs with dots described for 1925-Ps, only dots described on VAMs from other years.

Does anyone know what these dots are? Are they patterns on the die, or are they errors, like strikethrough retains of small metal debris? Given the greenish hue, they appear to have a higher copper content than the coin.

Also, my friend would like to know who to contact about seeing if this is an existing or maybe a new VAM?

I've attached some images including closeups and a couple of dot VAMs from different dates. I hope it is not overkill.